export default {
  // 为当前模块开启命名空间
  namespaced: true,

  // 模块的 state 数据
  state: () => ({
    // 购物车的数组，用来存储购物车中每个商品的信息对象
    // 每个商品的信息对象，都包含如下 6 个属性：
    // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
    cart: JSON.parse(uni.getStorageSync('cart') || '[]')
  }),

  // 模块的 mutations 方法
  mutations: {
	  addToCart(state, goods) {
		  const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
		  
		  
		  if (!findResult) {
			  state.cart.push(goods)
		  } else {
			  findResult.goods_count++
		  }
		  
		  
		this.commit('m_cart/saveToStorage')
	  },
	  saveToStorage(state) {
	  	uni.setStorageSync('cart', JSON.stringify(state.cart))
	  },
	  // 更新购物车中商品的勾选状态
	  updateGoodsState(state, goods) {
		 const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
		 
		 if (findResult) {
			 findResult.goods_state = goods.goods_state
			 
			 this.commit('m_cart/saveToStorage')
		 }
	  },
	  updateGoodsCoutn(state, goods) {
		const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
		
		if(findResult) {
			findResult.goods_count = goods.goods_count
			
			this.commit('m_cart/saveToStorage')
		}
	  },
	  removeGoodsById(state, goods_id) {
		  state.cart = state.cart.filter(x => x.goods_id !== goods_id)
		  
		  this.commit('m_cart/saveToStorage')
	  },
	  // 更新购物车中所以的商品选中状态
	  updateAllGoodsState(state, newState) {
	  	state.cart.forEach(x => x.goods_state = newState)
	  	
	  	 this.commit('m_cart/saveToStorage')
	  }
  },
	


  // 模块的 getters 属性
  getters: {
	  // 购物车中所以商品的总数量
	  total(state) {
		  // let c = 0
		  // state.cart.forEach(x => c += x.goods_count)
		  // return c
		  
		  
		 return state.cart.reduce((total, item) => total += item.goods_count, 0)
		  
	  },
	  // 购物车中已勾选的商品总数量
	  checkedCount(state) {
		 return state.cart.filter(x => x.goods_state).reduce((total,item) =>  total += item.goods_count, 0)
	  },
	  // 已勾选商品的总价格
	  checkedGoodsAmount(state) {
		 return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count * item.goods_price, 0).toFixed(2)
	  }
  },
}